LangChainhttps://www.langchain.comLLM app framework + LangGraph. LlamaIndexhttps://www.llamaindex.aiRAG + agent data framework. LangChain.jshttps://js.langchain.comLangChain for TypeScript. Pydantic AIhttps://ai.pydantic.devType-safe agent framework. LangChain4jhttps://github.com/langchain4j/langchain4jLangChain for Java. Spring AIhttps://spring.io/projects/spring-aiAI applications on Spring. Vercel AI SDKhttps://sdk.vercel.aiThe AI app SDK for TS. Mastrahttps://mastra.aiTS agent framework. Genkithttps://genkit.devGoogle's AI app framework. VoltAgenthttps://voltagent.devTS multi-agent framework. langchaingohttps://github.com/tmc/langchaingoLangChain for Go. Einohttps://github.com/cloudwego/einoCloudWeGo's LLM app framework. rigginghttps://github.com/0xPlaygrounds/rigRust LLM app framework. llm-chainhttps://github.com/sobelio/llm-chainRust LLM chains. LangChain.rbhttps://github.com/patterns-ai-core/langchainrbLangChain for Ruby. AgentMailhttps://agentmail.toEmail inboxes for agents. Azure AI Foundryhttps://ai.azure.comMicrosoft's AI app platform. Vertex AI Agent Builderhttps://cloud.google.com/products/agent-builderGCP agent platform. NEAR Protocolhttps://near.orgAgent-oriented chain with a jobs market. x402https://x402.orgHTTP-native micropayment protocol for agents. awesome-llm-apps collectionhttps://github.com/Shubhamsaboo/awesome-llm-appsCurated LLM app collection — RAG, agents, voice, MCP examples.